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In situ-forming injectable hydrogels are smart biomaterials that can be implanted into living bodies with minimal invasion. Due to pioneer work of Prof. Sung Wan Kim in this field, injectable hydrogels have shown great potentials in many different biomedical applications. Biodegradable and injectable hydrogels can be administered at room temperature as viscous polymer sols. They will degrade after accomplishing their tasks. Before injecting into living bodies, active substances can be loaded into viscous polymer sols with a high loading efficiency by simple mixing. After injecting into living bodies, active substances-loaded hydrogels can be formed and active substances can be released in a controlled manner upon diffusion or polymer degradation. Due to their outstanding properties and unique features, injectable hydrogels are very promising in many biomedical applications including drug/protein/gene delivery, tissue engineering, and regenerative medicine. In this review, we briefly introduce recent development of several important types of in situ-forming injectable hydrogels reported by our group during the last three years. Important properties and potential applications (such as cancer therapy, insulin release and wound healing) of these injectable hydrogels are reviewed. Challenges and perspectives in this research field are also discussed.